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Cothmoth - I am experiencing VERY similar symptoms with my boy. He had a stone a year and a half ago and we monitor him. Frequent urination after work, getting darker and darker in color - had it tested, there are crystals and red blood cells in the urine. Ultrasound hasn't shown a stone (though somehow he peed both times right before, so it was harder to see). Did you have any success with the flushing via catheter? How did things end up?